The ducks, geese, and swans of North America; a vade mecum for the naturalist and the sportsman Kortright, Francis H. creator Wildlife Management Institute. contributor text book Harrisburg, Pa Stackpole Co [1960, c1953] 1960
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ENG Anatidae Birds North America https://www.biodiversitylibrary.org/bibliography/23890 1041321 10.5962/bhl.title.23890